Characterization of hemicyanine Langmuir-Blodgett films by picosecond time-resolved fluorescence |
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| Authors: | Abraham Emmanuel Grauby-Heywang Christine Selector Sophia Jonusauskas Gediminas |
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| Affiliation: | Centre de Physique Moléculaire Optique et Hertzienne, UMR 5798, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence, France. em.abraham@cpmoh.u-bordeaux1.fr |
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| Abstract: | Hemicyanine Langmuir-Blodgett films have been elaborated and characterized using stationary and time-resolved spectroscopic techniques. Depending on the experimental conditions, especially the pH of the water subphase, the absorption spectra of the films indicate the presence of non-fluorescent H-aggregates in the monolayer. Time-resolved fluorescence measurements revealed three mono-exponential decay times: a very short one (20-23 ps) attributed to an excited intramolecular charge transfer state and two longer ones (100-120 ps and 400-590 ps) attributed to the photoisomerization of the chromophores. |
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